josh/parport-2x20vfd
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added setPPLines(), sendNibble(), and sendByte() VFD functions

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git-svn-id: svn://anubis/misc/parport-2x20vfd@111 bd8a9e45-a331-0410-811e-c64571078777
This commit is contained in:
josh 2009-05-03 20:50:34 +00:00
parent 3f8b4d0b5a
commit dcba2c00fe
2 changed files with 41 additions and 4 deletions
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28
VFD.cc
View File

@ -69,3 +69,31 @@ void VFD::disconnect()
m_ppfd = -1;
}
}
void VFD::setPPLines(unsigned char bits)
{
if (m_ppfd >= 0)
{
ioctl(m_ppfd, PPWDATA, &bits);
}
}
void VFD::sendNibble(unsigned char rs, unsigned char dat)
{
setPPLines( (rs << PP_OFFSET_RS)
| (E_DISABLE << PP_OFFSET_E)
| (RW_WRITE << PP_OFFSET_RW)
| ((dat & 0xF) << PP_OFFSET_DATA) );
usleep(1);
setPPLines( (rs << PP_OFFSET_RS)
| (E_ENABLE << PP_OFFSET_E)
| (RW_WRITE << PP_OFFSET_RW)
| ((dat & 0xF) << PP_OFFSET_DATA) );
usleep(1);
}
void VFD::sendByte(unsigned char rs, unsigned char dat)
{
sendNibble(rs, (dat >> 4) & 0xF);
sendNibble(rs, dat & 0xF);
}

17
VFD.h
View File

@ -32,17 +32,26 @@
class VFD
{
public:
VFD();
bool connect(const std::string & parport = "/dev/parport0");
void disconnect();
protected:
static const unsigned char RW_WRITE = 0;
static const unsigned char RW_READ = 1;
static const unsigned char E_ENABLE = 0;
static const unsigned char E_DISABLE = 1;
static const unsigned char RS_COMMAND = 0;
static const unsigned char RS_DATA = 1;
VFD();
bool connect(const std::string & parport = "/dev/parport0");
void disconnect();
static const unsigned char PP_OFFSET_RS = 0;
static const unsigned char PP_OFFSET_RW = 1;
static const unsigned char PP_OFFSET_E = 2;
static const unsigned char PP_OFFSET_DATA = 3;
void sendByte(unsigned char rs, unsigned char dat);
void sendNibble(unsigned char rs, unsigned char dat);
void setPPLines(unsigned char bits);
protected:
int m_ppfd; /* parallel port file descriptor */
};